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A maintenance manager describes the confusion using his carrier's maintenance computer systems coding procedures; when trying to properly defer a B757-200 captain's #3 fixed rear window for delamination that was approaching; but not exceeding limits.
| Attributes | |
| ACN | 785293 |
| Time | |
| Date | 200804 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : inspector |
| Qualification | technician : airframe technician : powerplant |
| ASRS Report | 785293 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : non compliance with mel maintenance problem : improper documentation non adherence : far non adherence : published procedure |
| Independent Detector | other other : 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : engineering procedure contributing factor : briefing contributing factor : manuals performance deficiency : non compliance with legal requirements performance deficiency : training performance deficiency : logbook entry |
| Supplementary | |
| Problem Areas | Company Maintenance Human Performance Aircraft Chart Or Publication |
| Primary Problem | Maintenance Human Performance |
| Situations | |
| Publication | M.E.L Manuals |
Narrative:
Flight deck; captain's rear fixed window delamination; approaching but not exceeding limits. Crew write-up. Addressed per amm limits amm 56-11-12-991-018 and programmed window for future replacement using deferral code. Off-going flight crew wrote this window up upon arrival. Item cleared as in limits but deferred to be replaced prior to progressing beyond limits and causing a delay or cancellation. Maintenance procedure manual makes references to cabin item list and deferral list (ndl) to refer to for items that can be deferred by the code. All those items outside these lists moc must be notified. I read the maintenance procedures manual and felt that I could use this to defer and program the window. If I would have read further; I would have never used that code. I was unaware at the time that the window I was programming was not on these lists.
Original NASA ASRS Text
Title: A MAINT MANAGER DESCRIBES THE CONFUSION USING HIS CARRIER'S MAINT COMPUTER SYSTEMS CODING PROCEDURES; WHEN TRYING TO PROPERLY DEFER A B757-200 CAPTAIN'S #3 FIXED REAR WINDOW FOR DELAMINATION THAT WAS APPROACHING; BUT NOT EXCEEDING LIMITS.
Narrative: FLT DECK; CAPT'S REAR FIXED WINDOW DELAMINATION; APCHING BUT NOT EXCEEDING LIMITS. CREW WRITE-UP. ADDRESSED PER AMM LIMITS AMM 56-11-12-991-018 AND PROGRAMMED WINDOW FOR FUTURE REPLACEMENT USING DEFERRAL CODE. OFF-GOING FLT CREW WROTE THIS WINDOW UP UPON ARR. ITEM CLRED AS IN LIMITS BUT DEFERRED TO BE REPLACED PRIOR TO PROGRESSING BEYOND LIMITS AND CAUSING A DELAY OR CANCELLATION. MAINT PROC MANUAL MAKES REFS TO CABIN ITEM LIST AND DEFERRAL LIST (NDL) TO REFER TO FOR ITEMS THAT CAN BE DEFERRED BY THE CODE. ALL THOSE ITEMS OUTSIDE THESE LISTS MOC MUST BE NOTIFIED. I READ THE MAINT PROCS MANUAL AND FELT THAT I COULD USE THIS TO DEFER AND PROGRAM THE WINDOW. IF I WOULD HAVE READ FURTHER; I WOULD HAVE NEVER USED THAT CODE. I WAS UNAWARE AT THE TIME THAT THE WINDOW I WAS PROGRAMMING WAS NOT ON THESE LISTS.
Data retrieved from NASA's ASRS site as of May 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.